X+10+x=20

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Solution for X+10+x=20 equation: 



X+10+X=20

We move all terms to the left:

X+10+X-(20)=0

We add all the numbers together, and all the variables

2X-10=0

We move all terms containing X to the left, all other terms to the right

2X=10

X=10/2

X=5

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